(b) The restrictions in Clause 15.17(a) with respect to disclosure
 of confidential information shall not apply to any information
 which any party demonstrates (i) becomes available to the
 public other than as a result of a disclosure by such party or
 its representatives; (ii) was available to such party on a
 nonconfidential basis prior to its disclosure pursuant to this
 Agreement; (iii) becomes available to such party on a
 nonconfidential basis from a source other than the other party
 hereto or its representatives, (iv) it is compelled to or
 required to disclose by legal action; (v) is required in
 connection with any litigation hereunder; (vi) is required in
 connection with a disposition or other transfer of rights
 permitted or consented to in writing by both parties
 hereunder; or (vii) is required or advised based on legal
 advice of counsel in order to protect and perfect the
 interests and rights of Lessor hereunder; provided the
 proposed transferee agrees in writing to be bound by the
 provisions of this Clause 15.17, each party shall only be
 required to use the same degree of care to prevent
 unauthorized disclosure of the information described above as
 it would use to prevent the disclosure of its own commercial
 and financial information of the same or similar nature and
 which it considers proprietary or confidential.

 15.18 LIABILITY OF LESSOR LIMITED: